This dataset includes SNMP and tcpdump records from 4 access points at a three-day computer-science conference.
last modified : 2006-11-14
release date : 2002-04-23
date/time of measurement start : 2001-08-29
date/time of measurement end : 2001-08-31
collection environment : We recorded over three days at the ACM SIGCOMM'01 conference held at U.C. San Diego in August 2001. The conference was held on two full days, a Wednesday and Thursday, and one half day, a Friday. The scheduled times of the conference on each day are as follows: 8:00-18:00 for the full days, and 8:00-14:00 on the half day.
network configuration : Our wireless LAN was an IEEE 802.11b network installed in a large auditorium where the conference sessions were held. The auditorium has dimensions of 110x60x27 ft and was covered by four ORiNOCO AP-1000 wireless access points, labeled NorthEast (NE), NorthWest (NW), SouthEast (SE), and SouthWest (SW), installed in the ceiling. The APs provided overlapping coverage in the auditorium and the lobby. The western APs were close to the stage. The eastern APs were at the back of the room close to the main entrances, also providing coverage to the lobby. The subnet of APs was connected to a Cisco Catalyst 2924 switch over a 100BaseT link, which connected to the venue's intranet, then the campus gigabit backbone, and finally to the Internet. The APs were operating at a data rate of 11 Mbps, on channels 1, 4, 7, and 11, and at a power of 100mW. The AP handoff algorithm was configured to use 'small' cells. The wireless user community consisted of 195 distinct users (distinct MAC addresses), roughly 40% of the total attendees. User wireless hardware was heterogeneous, as attendees used their own personal wireless cards, and the trace includes traffic from 8 different vendors.
data collection methodology : The collected data consists of two parts. The first part is a record of SNMP performance monitoring data sampled from wireless access points (APs) serving the conference. The second part is a tcpdump trace consisting of anonymized packet headers of all wireless traffic. Both parts of the trace span all three days of the conference, capturing the workload of about 300,000 flows from 195 users consuming 4.6 GB of bandwidth.
sanitization : We anonymized the tcpdump trace using tcpdpriv to remove all sensitive information including, packet payloads and IP addresses in packet headers.
SNMP records from 4 access points at a three-day computer-science conference.
- files: Snmp_Stations.tar.gz, Snmp_AP_Mibtree.tar.gz
- description: This traceset includes SNMP records from 4 access points at a three-day computer-science conference.
- measurement purpose: Usage Characterization, Network Performance Analysis
- methodology: We collected a continuous trace of SNMP data from each of the four APs over a period of 52 hours from the start of the conference. The SNMP data consisted of aggregate packet level statistics of all traffic through both interfaces of the APs, including information at the link, network, and transport levels. In addition, the trace also contained detailed information about the mobile users associated to each of the APs, including the MAC address, the received signal-to-noise ratio (SNR), and the effective throughput.
- Stations: SNMP records for the stations assocated with 4 access points at a three-day computer-science conference.
- configuration: The trace-collection routine polled the APs at one minute intervals.
This trace contains 12 trace files. Those files are
named Stations_%AP_Name%_%Day%.out -- where %AP_Name%
can be one of NE, NW, SE, or SW; and %Day% can be Wed, Thu,
or Fri. Thus the trace file for the NE AP on Wednesday,
is Stations_NE_Wed.out. The SNMP OID used to generate these
trace files was .220.127.116.11.4.1, which corresponds to the MIB
entry for "Associated Stations" and gives the MAC address,
average received SNR, total transmitted bytes, and total
transmitted packets for each mobile station associated to
Each poll entry begins with a timestamp and entries from
successive polls are separated by the line "End of MIB subtree".
- AP_Mibtree: SNMP records for 4 access points at a three-day computer-science conference.
- configuration: The APs are polled at one-minute intervals.
This trace contains 12 trace files. Those files are named
AP_%AP_Name%_%Day%.out -- where %AP_Name% can be one of
NE, NW, SE, or SW; and %Day% can be Wed, Thu, or Fri.
Thus the trace file for the NE AP on Wednesday, is
AP_NE_Wed.out. These files were generated using the
SNMP OID .18.104.22.168.2.1, which walks the entire MIB tree.
Each poll begins with a timestamp and ends with the line
"End of MIB subtree". These trace files contain all
information recorded at the AP at the MAC, network,
transport, and application layers. For example,
the number of total unicast and multicast packets (bytes)
transmitted and recevied, the number of unicast and
multicast MAC-level errors and retransmissions, etc.
Tcpdump traceset from the wireless network at a three-day computer-science conference.
- files: sigcomm01.pcap.gz
- description: This traceset includes tcpdump records from the wireless network at a three-day computer-science conference.
- measurement purpose: Usage Characterization
- methodology: We recorded the networklevel headers of the packets passing through the Cisco Catalyst 2924 switch for the duration of the conference.
- sanitization: We used tcpriv to anonymize sensitive information like sender and receiver IP addresses to protect user privacy, and discarded all packet payloads.
- 08292005: Tcpdump trace from the wireless network at a three-day computer-science conference.
- configuration: The trace represents a collection of all the wireless IP traffic over the entire period of the conference.
The files in this directory are a CRAWDAD dataset hosted by IEEE-Dataport.
About CRAWDAD: the Community Resource for Archiving Wireless Data At Dartmouth is a data resource for the research community interested in wireless networks and mobile computing.
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You can use this DOI and text to cite (bibtext): Anand Balachandran, Geoffrey M. Voelker, Paramvir Bahl, P. Venkat Rangan, ucsd/sigcomm2001, https://doi.org/10.15783/C72P4P , Date: 20020423
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These datasets are part of Community Resource for Archiving Wireless Data (CRAWDAD). CRAWDAD began in 2004 at Dartmouth College as a place to share wireless network data with the research community. Its purpose was to enable access to data from real networks and real mobile users at a time when collecting such data was challenging and expensive. The archive has continued to grow since its inception, and starting in summer 2022 is being housed on IEEE DataPort.